3. Why are the handles of many electrical appliances made of rubber or plastic?

Nastena04111996 3 сент. 2021 г., 00:02:41

Because rubber and plastic are insulating materials.

This prevents the user from an electric shock.

Yanko2013 24 мая 2021 г., 04:05:28 | 5 - 9 классы

Как правильно пишется How many children in the yard или How many children are in the yard?

Как правильно пишется How many children in the yard или How many children are in the yard.

Юлау 12 мая 2021 г., 00:48:48 | 5 - 9 классы

Помогите, очень нужен перевод?

Помогите, очень нужен перевод.

The Development of Rubber Here is the story of rubber.

From the earliest time it was common knowledge the Peruvians that when a cut was made in the outside skin of a rubber tree , a white dliquid milk came out , and that this a sticky mass of rubber might be made .

This rubber is soft when warm, so that it is possible to give it any .

The Peruvians made the that it was very good for keeping out the wet.

Then in the early 1800's , the Americans made use of it for the first time .

First they made overshoes to their feet dry.

Then came a certain Mr.

Mackintosh, who made coats of cloth covered with natural rubber.

From that day to this we have been coating cloth with rubber as Mr.

Mackintosh, and our raincoats are still named after him.

But these first rubber overshoes and raincoats were all soft and sticky in summer, and and inelastic in the winter when it was cold.

But the rubber we have today is soft and elastiс, very strong - even in the warmest summer and the coldest winter.

This was made by a man called Goodyear.

After many , he found that nitric acid made the rubber much better, but it is not hard and strong enough.

Then a strange thing took .

A friend of his , Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulphur and put in the sun.

Goodyear put this idea the test, and saw that it did have more or less the desired effect - though somewhat less than more.

The only effect it had was on the outside of the drubber.

It is common knowledge now that the to make rubber hard and strong is by heating dit with sulphur.

GRNIK 7 июн. 2021 г., 07:16:29 | 10 - 11 классы

All the computers _____ (made, are making, are made) on the base of microprocessors?

All the computers _____ (made, are making, are made) on the base of microprocessors.

Fridmanmargo 7 апр. 2021 г., 05:27:14 | 5 - 9 классы

Задайте вопросы для получения большей информации?

Задайте вопросы для получения большей информации.

Many geusts are invited to the party.

Where?

Why? Brich trees are found in Russia.

What (associated with)?

Sabakak2009 19 мар. 2021 г., 14:01:48 | 5 - 9 классы

Why are the rainforest in danger?

Why are the rainforest in danger?

Ti09072004 8 апр. 2021 г., 07:02:17 | 5 - 9 классы

Why are the rainforest in danger?

Why are the rainforest in danger?

Bee78 10 апр. 2021 г., 18:41:30 | 5 - 9 классы

Помоги пожалуйста?

Помоги пожалуйста!

)0)

Read the text again and match two parts of the sentences.

1) Plastic doesn't

2) Half the rubbish on our beaches

3) Plastic uses a lot

4) Celluloid is used to

5) Nylon is used to

6) The plastic we use the most

a) make clothes

b) of oil

c) is called Polyethylene

d) is made of plastic

e) change

f) make films.

Koreev99 21 мая 2021 г., 15:09:40 | 5 - 9 классы

Match the objects in exercise 1 the materials they are made from?

Match the objects in exercise 1 the materials they are made from.

(Some objects are made om more than one material) Then listen and check,.

Тепа1770 18 сент. 2021 г., 13:54:51 | 1 - 4 классы

Какое слово лишнее How many are the trousers?

Какое слово лишнее How many are the trousers?

Dasha111111111111 31 мар. 2021 г., 08:12:28 | 5 - 9 классы

Uderline the correct variant, paying attention to the collective nouns?

Uderline the correct variant, paying attention to the collective nouns.

1. A pack of wolves (is seen / are seen) in the distsnce.

2. Clothes (is made, are made) of various materials, such as wool or cotton.

3. The cattle (is, are) in the shed.

4. There (is, are) usually many goods in the department store.

5. The sweepings (is, are)always seen in her room whenever you enter it.